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Title: Full-field optical deformation measurement in biomechanics: Digital speckle pattern interferometry and 3D digital image correlation applied to bird beaks
Authors: Soons, Joris ×
Lava, Pascal
Debruyne, Dimitri
Dirckx, Joris #
Issue Date: 2012
Publisher: Elsevier Science BV
Series Title: Journal of the Mechanical Behavior of Biomedical Materials vol:14 pages:186-191
Abstract: In this paper two easy-to-use optical setups for the validation of biomechanical finite element (FE) models are presented. First, we show an easy-to-build Michelson digital speckle pattern interferometer (DSPI) setup, yielding the out-of-plane displacement. We also introduce three-dimensional digital image correlation (3D-DIC), a stereo photogrammetric technique. Both techniques are non-contact and full field, but they differ in nature and have different magnitudes of sensitivity. In this paper we successfully apply both techniques to validate a multi-layered FE model of a small bird beak, a strong but very light biological composite. DSPI can measure very small deformations, with potentially high signal-to-noise ratios. Its high sensitivity, however, results in high stability requirements and makes it hard to use it outside an optical laboratory and on living samples. In addition, large loads have to be divided into small incremental load steps to avoid phase unwrapping errors and speckle de-correlation. 3D-DIC needs much larger displacements, but automatically yields the strains. It is more flexible, does not have stability requirements, and can easily be used as an optical strain gauge.
ISSN: 1751-6161
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Technologiecluster Materialentechnologie
Materials Technology TC @ KAHO Sint-Lieven
Metallurgy and Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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